Supervisory Genset Control for REEV Transient and Emissions Management
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Solution Overview
Problem
Range-extended electric vehicles (REEVs) experience undesired transient performance during sudden power demand changes and fail to consider emissions in their control systems, making it difficult to integrate a stand-alone genset into other REEVs.
Innovation Solution
A supervisory control system comprising an overall system control unit, an engine control module, power electronics, and a supervisory control module that determines and optimizes speed and torque targets for the range extender and generator, considering power demand, emissions, and dynamic genset models to manage transient performance and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional control setup with separate system controls and genset control system is used, then the control architecture is simple to implement, but transient performance deteriorates during sudden power demand changes
Solution Approach 1:
The patent merges the separate system controls and genset control system into a unified supervisory control module that simultaneously manages power demand, emissions, and genset operations. This integration allows coordinated control of the range extender and generator, eliminating the transient performance issues caused by independent control systems while maintaining architectural simplicity through a single modular control unit.
Solution Approach 2:
The supervisory control module acts as an intermediary between the overall system control unit and the individual genset components (range extender and generator). It receives power demand information from the system control unit and translates it into coordinated speed and torque commands for the genset components, ensuring smooth transient response while maintaining the hierarchical control structure.
2Device complexity
If conventional genset control is used, then control implementation is straightforward, but emissions are not considered during transient performance
Solution Approach 1:
The supervisory control module is designed as a multi-functional control unit that simultaneously optimizes for power delivery, emissions reduction, and transient performance. It integrates emissions modeling and optimization algorithms directly into the control logic, allowing the same control structure to handle both conventional control tasks and emissions management without requiring separate control systems.
Solution Approach 2:
The control system dynamically adjusts genset operating parameters (speed and torque) based on real-time conditions and emissions considerations. The supervisory control module modifies these parameters to keep the genset operating in emission-efficient regions during transient events, while still meeting power demand requirements, thereby reducing harmful emissions without complicating the control implementation.
3Device complexity
If genset control resides in a hybrid system control module with separate communications, then system modularity is maintained, but integration of stand-alone genset becomes difficult
Solution Approach 1:
The control system is segmented into distinct functional modules: an overall system control unit for high-level power management and a supervisory control module for detailed genset control. This segmentation allows the supervisory control module to be designed as a standalone unit that can interface with different genset configurations, improving integration capability while maintaining system modularity through standardized communication protocols.
Solution Approach 2:
The supervisory control module is designed as a universal control unit that can manage various genset configurations (stand-alone or integrated). It provides standardized interfaces and communication protocols that enable seamless integration with different REEV platforms, making the control system adaptable to various genset implementations while maintaining the modular architecture benefits.
Data Source
AI summary
A controls system for a range-extended electric vehicle comprising an overall system control unit, an engine control module configured to control a range extender of the range-extended electric vehicle, power electronics configured to control a generator of the range-extended electric vehicle, and a supervisory control module coupled between the overall system control unit and the engine control module and the power electronics, the supervisory control module configured to receive information from the overall system control unit and provide commands to the engine control module and the power electronics.